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'[EE:] Audio Switch IC's?'
2003\12\10@071714 by Hulatt, Jon

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Hi,

Does anyone know of a chip that can switch stereo line-level audio signals?
I want my pic circuit to be able to switch between two stereo sources, with
one output to an amplifier, without nasty crackles or pops.

Thanks

Jon

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2003\12\10@075039 by SavanaPics

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MAXIM has a chip that will switch audio and video.  I don't remember the part
number but  a company called NCD  <A HREF="http://www.controlanything.com">http://www.controlanything.com</A>  or <A HREF="http://www.controleverything.com">
http://www.controleverything.com</A>   you may also try spam_OUTncdryanTakeThisOuTspamaol.com. He is the designer of the
circuits.  If you can't find the infor, contact me offline and I will see if I can
get it for you, as I have the sheets here just not at this desk

Eddie, kc4awz

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2003\12\10@080115 by James Cameron

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I've used a TEA6300, no idea if it is still available.  I found a set
of them surplus from a MPEG card on an engineering project at Digital
about ten years ago.  We didn't need these little audio boards, so they
were chucked.

On 10th October 1993, says my Forth source, I got them working.  They
use I2C interfacing; SCL and SDA lines.  They had multiple input
channels, stereo, volume, tone, and a fader.  I was using them on an
80C85 platform, running FigForth.

Maybe there are later alternative chips.

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2003\12\10@081402 by SavanaPics

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Found the info:

Maxim MAX306/307
National LMC1992

But check out <A HREF="http://www.controlanything.com">http://www.controlanything.com</A>  they have these done in 4 and 8
channel seriallly controlled boards

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2003\12\10@082850 by Rick C.

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I use a cheap, easy to get, CD4016 or 4066. It has four switches that can be
controlled by a logic level. Clean switching and ~50db cutoff. I use it to
switch audio circuits in broadcast equipment. The 4016 can actually fade up or
down. Will work on a single 5 volt supply. If anyone's interested, I can post a
schematic. Actually, a j-fet will do the same thing.
Rick - Chief Engineer, WTRM-FM

"Hulatt, Jon" wrote:

> Hi,
>
> Does anyone know of a chip that can switch stereo line-level audio signals?
> I want my pic circuit to be able to switch between two stereo sources, with
> one output to an amplifier, without nasty crackles or pops.
>
> Thanks
>
> Jon

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2003\12\10@083511 by SM Ling

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Search the Philips and National Semi sites.  Some have amplfier built-in.

Ling Sm


> Does anyone know of a chip that can switch stereo line-level audio
signals?
> I want my pic circuit to be able to switch between two stereo sources,
with
> one output to an amplifier, without nasty crackles or pops.

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2003\12\10@083720 by Carey Fisher - NCS

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I'd like to see the schematic of a 4016 based fader.
Carey

----- Original Message -----
From: "Rick C." <rixyspamKILLspamVVALLEY.COM>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Wednesday, December 10, 2003 8:26 AM
Subject: Re: [EE:] Audio Switch IC's?


> I use a cheap, easy to get, CD4016 or 4066. It has four switches that can
be
> controlled by a logic level. Clean switching and ~50db cutoff. I use it to
> switch audio circuits in broadcast equipment. The 4016 can actually fade
up or
> down. Will work on a single 5 volt supply. If anyone's interested, I can
post a
> schematic. Actually, a j-fet will do the same thing.
> Rick - Chief Engineer, WTRM-FM
>
> "Hulatt, Jon" wrote:
>
> > Hi,
> >
> > Does anyone know of a chip that can switch stereo line-level audio
signals?
> > I want my pic circuit to be able to switch between two stereo sources,
with
{Quote hidden}

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2003\12\10@090857 by John Walker

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I'd be interested in getting a copy of the schematic. I have some audio
work I'm looking into and this may come in handy.

Thank,
John

--On Wednesday, December 10, 2003 8:26 AM -0500 "Rick C."
<EraseMErixyspam_OUTspamTakeThisOuTVVALLEY.COM> wrote:

{Quote hidden}

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2003\12\10@104504 by Josh Koffman

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Add me to the list too please!

Josh
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completely foolproof is to underestimate the ingenuity of complete
fools.
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Carey Fisher - NCS wrote:
>
> I'd like to see the schematic of a 4016 based fader.

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2003\12\10@104711 by Josh Koffman
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I believe it was the magazine Radio Electronics that once published a
home audio switcher. I don't remember the date though. Have you checked
out http://www.epanorama.net? He's got tons of stuff, might have
something that suits you.

Josh
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completely foolproof is to underestimate the ingenuity of complete
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"Hulatt, Jon" wrote:
> Does anyone know of a chip that can switch stereo line-level audio signals?

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2003\12\10@115938 by Mike Hord

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Someone suggested the MAX306/307;  I'm using a MAX308 right now
to switch what is essentially audio level signals (actually quite a bit
larger).

Maxim also has a slightly nicer chip, the MAX4508.  I haven't been able to
find a source for it, though, so YMMV.

You may also want to look at the TPA152 or TPA122 audio amplifiers from
TI.  These have a built-in pop-reduction feature, which allows them to
be muted without that characteristic popping sound, and both are stereo
output.  My idea would be to use the MAX30x chip to switch, then put
the TPAxxx chip after that with unity gain.  Mute the TPAxxx amp, switch
your signal, unmute the amp.  Simple.

Best part is, all of these chips are available as samples, so if this is a
one-off,
it'll be easy on the pocketbook!

Mike H.

{Quote hidden}

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2003\12\10@121225 by John Ferrell

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Me too!
I have inherited the audio at my church in spite of pleading ignorence.
Every little bit will help me understand.

{Original Message removed}

2003\12\10@145008 by NaB25J

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Could I get on the list for that schematic too?

-Tony


jjwspamspam_OUTSEI.CMU.EDU writes:

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2003\12\10@150217 by Tal

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Tony

look at google for cd4066
you'll find many links

Great chip i use it a lot lately.
Tal

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Sent: Wednesday, December 10, 2003 9:49 PM
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Subject: Re: [EE:] Audio Switch IC's?


Could I get on the list for that schematic too?

-Tony


TakeThisOuTjjwEraseMEspamspam_OUTSEI.CMU.EDU writes:

> I'd be interested in getting a copy of the schematic. I have some audio
> work I'm looking into and this may come in handy.
>
> Thank,
> John
>
> --On Wednesday, December 10, 2003 8:26 AM -0500 "Rick C."
> <RemoveMErixyspamTakeThisOuTVVALLEY.COM> wrote:
>
> > I use a cheap, easy to get, CD4016 or 4066. It has four switches that
can
> > be controlled by a logic level. Clean switching and ~50db cutoff. I use
> > it to switch audio circuits in broadcast equipment. The 4016 can
actually
{Quote hidden}

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2003\12\10@150555 by NaB25J

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Will do, thanks.

-Tony


kooterEraseMEspam.....012.NET.IL writes:

> Tony
>
> look at google for cd4066
> you'll find many links
>
> Great chip i use it a lot lately.
> Tal
>
> {Original Message removed}

2003\12\10@204857 by Rick C.

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I have the site partially up now. I will give you a detailed example of your
circuit you requested on the same site tomorrow.
Pardon the hand scribbled schematics. Will clean them up with Orcad in a few
days.
http://www.pic101.com/audiosw

Rick

"Hulatt, Jon" wrote:

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2003\12\10@210724 by Russell McMahon

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> I have the site partially up now. I will give you a detailed example of
your
> circuit you requested on the same site tomorrow.
> Pardon the hand scribbled schematics. Will clean them up with Orcad in a
few
> days.
> http://www.pic101.com/audiosw

Switches using a FET as this does or transmission gates (a number of FETs
inside) can have their isolation greatly improved if needed by adding a
shorting device across the output (or at an intermediate point). The
shorting device is switched in antiphase with the enable device.  I had a
design that used VERY high power levels and that could tolerate only very
low leakage levels. Using a two part switch as above made all the
difference. Doing this you may have to pay attention to impedances under
various switching conditions.

       RM

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2003\12\10@212140 by Rick C.

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Correct. That is why the one drawing had a series and shunt fet. To multiplex
audio for stereo generation you have to have tight, clean switching. I also
designed an IFB system when I worked for NPR that also did that. I will
include such a you described for instructional purposes. But for simple
switching, what is shown is more than sufficient. I even switched video with
no image bleeding using the 4066/4051 and eliminating some of the resistors
and capacitors.
Rick

Russell McMahon wrote:

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2003\12\11@031735 by Jinx

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> switched video with no image bleeding using the 4066/4051

A technique to make a variable resistor with a 4066 gate is to
use a control signal that has a variable duty cycle. The effective
resistance becomes a function of Ron vs Roff. It's used in things
like musical synthesisers for voltage controlled filters, voltage
controlled amplifiers and so on. It's a handy way of converting a
waveform (that alters the duty cycle of an oscillator) to a varying
resistance

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2003\12\11@144230 by Peter L. Peres

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> To multiplex audio for stereo generation you have to have tight, clean
> switching.

Why ? Stereo is sent as L+R and L-R. L-R is L+R-2*R. This requires just
one switch and the insulation need not be so good as it can be compensated
for by adjusting the gains (of the straight R and of the -2R separately).
What am I missing ?

Peter

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